IIRC there are two registries that it’s worth joining in the UK, and you can apply to join one of them online and the other whenever you donate blood:
http://www.anthonynolan.org/8-ways-you-could-save-life/donate-your-stem-cells/apply-join-our-register
http://www.nhsbt.nhs.uk/bonemarrow/qa/index.asp#howcan
This appears to be the place to sign up in Canada:
https://www.blood.ca/en/stem-cells
(It seems that in some countries the term to search for is “stem cell donation for leukaemia” or somesuch.)
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IIRC there are two registries that it’s worth joining in the UK, and you can apply to join one of them online and the other whenever you donate blood:
http://www.anthonynolan.org/8-ways-you-could-save-life/donate-your-stem-cells/apply-join-our-register
http://www.nhsbt.nhs.uk/bonemarrow/qa/index.asp#howcan
This appears to be the place to sign up in Canada:
https://www.blood.ca/en/stem-cells
(It seems that in some countries the term to search for is “stem cell donation for leukaemia” or somesuch.)